package parse_and_index.search.lucene;

//package org.apache.lucene.demo;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Date;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.Version;

/** Simple command-line based search demo. */
public class SearchFiles {

	  /**
	   * This demonstrates a typical paging search scenario, where the search engine presents pages of size n to the user. The user can then go to the next page if interested in the next hits.
	   * 
	   * When the query is executed for the first time, then only enough results are collected to fill 5 result pages. If the user wants to page beyond this limit, then the query is executed another time and all hits are collected.
	   * 
	   */
	  public static void doPagingSearch(final BufferedReader in, final IndexSearcher searcher, final Query query, final int hitsPerPage, final boolean raw, final boolean interactive) throws IOException {

			// Collect enough docs to show 5 pages

			final TopDocs results = searcher.search(query, 5 * hitsPerPage);

			ScoreDoc[] hits = results.scoreDocs;

			final int numTotalHits = results.totalHits;
			System.out.println(numTotalHits + " total matching documents");

			int start = 0;
			int end = Math.min(numTotalHits, hitsPerPage);

			while (true) {
				  if (end > hits.length) {
						System.out.println("Only results 1 - " + hits.length + " of " + numTotalHits + " total matching documents collected.");
						System.out.println("Collect more (y/n) ?");
						final String line = in.readLine();
						if ((line.length() == 0) || (line.charAt(0) == 'n')) {
							  break;
						}

						hits = searcher.search(query, numTotalHits).scoreDocs;
				  }

				  end = Math.min(hits.length, start + hitsPerPage);

				  for (int i = start; i < end; i++) {
						if (raw) { // output raw format
							  final Document doc = searcher.doc(hits[i].doc);// dodao
							  final String path = doc.get("path");// dodao
							  System.out.println((i + 1) + ". name: " + new File(path).getName() + " doc=" + hits[i].doc + " score=" + hits[i].score);
							  continue;
						}

						final Document doc = searcher.doc(hits[i].doc);
						final String path = doc.get("path");
						if (path != null) {
							  System.out.println((i + 1) + ". " + path);
							  final String title = doc.get("title");
							  if (title != null) {
									System.out.println("   Title: " + doc.get("title"));
							  }
						}
						else {
							  System.out.println((i + 1) + ". " + "No path for this document");
						}

				  }

				  if (!interactive || (end == 0)) {
						break;
				  }

				  if (numTotalHits >= end) {
						boolean quit = false;
						while (true) {
							  System.out.print("Press ");
							  if ((start - hitsPerPage) >= 0) {
									System.out.print("(p)revious page, ");
							  }
							  if ((start + hitsPerPage) < numTotalHits) {
									System.out.print("(n)ext page, ");
							  }
							  System.out.println("(q)uit or enter number to jump to a page.");

							  final String line = in.readLine();
							  if ((line.length() == 0) || (line.charAt(0) == 'q')) {
									quit = true;
									break;
							  }
							  if (line.charAt(0) == 'p') {
									start = Math.max(0, start - hitsPerPage);
									break;
							  }
							  else if (line.charAt(0) == 'n') {
									if ((start + hitsPerPage) < numTotalHits) {
										  start += hitsPerPage;
									}
									break;
							  }
							  else {
									final int page = Integer.parseInt(line);
									if (((page - 1) * hitsPerPage) < numTotalHits) {
										  start = (page - 1) * hitsPerPage;
										  break;
									}
									else {
										  System.out.println("No such page");
									}
							  }
						}
						if (quit) {
							  break;
						}
						end = Math.min(numTotalHits, start + hitsPerPage);
				  }
			}
	  }

	  /** Simple command-line based search demo. */
	  public static void initSearch(final String[] args) throws Exception {
			final String usage = "Usage:\tjava org.apache.lucene.demo.SearchFiles [-index dir] [-field f] [-repeat n] [-queries file] [-query string] [-raw] [-paging hitsPerPage]\n\nSee http://lucene.apache.org/java/4_0/demo.html for details.";
			if ((args.length > 0) && ("-h".equals(args[0]) || "-help".equals(args[0]))) {
				  System.out.println(usage);
				  System.exit(0);
			}

			String index = "index";
			String field = "contents";
			String queries = null;
			int repeat = 0;
			boolean raw = false;
			String queryString = null;
			int hitsPerPage = 10;

			for (int i = 0; i < args.length; i++) {
				  if ("-index".equals(args[i])) {
						index = args[i + 1];
						i++;
				  }
				  else if ("-field".equals(args[i])) {
						field = args[i + 1];
						i++;
				  }
				  else if ("-queries".equals(args[i])) {
						queries = args[i + 1];
						i++;
				  }
				  else if ("-query".equals(args[i])) {
						queryString = args[i + 1];
						i++;
				  }
				  else if ("-repeat".equals(args[i])) {
						repeat = Integer.parseInt(args[i + 1]);
						i++;
				  }
				  else if ("-raw".equals(args[i])) {
						raw = true;
				  }
				  else if ("-paging".equals(args[i])) {
						hitsPerPage = Integer.parseInt(args[i + 1]);
						if (hitsPerPage <= 0) {
							  System.err.println("There must be at least 1 hit per page.");
							  System.exit(1);
						}
						i++;
				  }
			}

			final IndexSearcher searcher = new IndexSearcher(FSDirectory.open(new File(index)));
			final Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_31);

			BufferedReader in = null;
			if (queries != null) {
				  in = new BufferedReader(new InputStreamReader(new FileInputStream(queries), "UTF-8"));
			}
			else {
				  in = new BufferedReader(new InputStreamReader(System.in, "UTF-8"));
			}
			final QueryParser parser = new QueryParser(Version.LUCENE_31, field, analyzer);
			while (true) {
				  if ((queries == null) && (queryString == null)) { // prompt the user
						System.out.println("Enter query: ");
				  }

				  String line = queryString != null ? queryString : in.readLine();

				  if ((line == null) || (line.length() == -1)) {
						break;
				  }

				  line = line.trim();
				  if (line.length() == 0) {
						break;
				  }

				  final Query query = parser.parse(line);
				  // System.out.println("Searching for: " + query.toString(field));

				  if (repeat > 0) { // repeat & time as benchmark
						final Date start = new Date();
						for (int i = 0; i < repeat; i++) {
							  searcher.search(query, null, 100);
						}
						final Date end = new Date();
						System.out.println("Bench Time: " + (end.getTime() - start.getTime()) + "ms");
				  }
				  // final Date startTime = new Date();
				  doPagingSearch(in, searcher, query, hitsPerPage, raw, (queries == null) && (queryString == null));
				  // final Date endTime = new Date();
				  // System.out.println("Time: " + (endTime.getTime() - startTime.getTime()) + "ms");

				  if (queryString != null) {
						break;
				  }
			}
			searcher.close();
	  }
}